yt

from The Collaborative International Dictionary of English v.0.48
Yt \Yt\, Yt \Yt\ ([th][a^]t),
   An old method of printing that (AS. [thorn][ae]t, [eth][ae]t)
   the "y" taking the place of the old letter "thorn" ([thorn]).
   Cf. {Ye}, the.
   [1913 Webster]
    
from The Free On-line Dictionary of Computing (8 July 2008)
yt

   <networking> The {country code} for Mayotte.

   (1999-01-27)
    

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